Hi all,

I've looked through the forum but can't find what I need.

I have a 7.2V battery pack (could be 8.4V pack at times) and need to fire a 12V relay.

Has someone got a simple DC voltage booster circuit that could handle small variations in input but still deliver 12V output. Coil resistance is about 160 - 180 ohms.

Frank

 

Linear Technologies makes a boost regulator LT1073 that looks like it would serve your purpose. The 12V fixed version would be the one to use. Digikey has the device in an 8-pin dip package for $5.50 each in single-piece quantities.

hgmjr

 

why do you need to boost it up? base on my experience, you can still make the relay work even the suply is 6V..

 

Better to use a 6V relay rather making a boost converter.

 

I agree that if you have the option to change the relay I would get a relay compatible with the voltage and current you have available.

The added circuitry needed for a DC to DC converter would take up more space on your board and would add needless complexity to the design.

hgmjr